Short people problems

If you play around in this part of Launch Base Zone 2 as Tails, you may find that when you attempt to progress to the right, the overhanging tube will be completely solid and push you straight into the spikes below.

What's happening is, right around this area is a collision change object that puts you on the front path when you cross over to the right, and gives you high priority so you go in front of the tube. However, the object is so poorly placed that Tails, being shorter than the other characters, misses it completely if he just walks along the floor.

Their first mistake was using the default 128 pixel length setting, which doesn't cover the 160 pixel gap between the floor and the ceiling. But once you cross over to the right, there's another problem: the entire tube is now intangible, which means you can just jump over the object and go back to the left side with the wrong priority.

Moral of the story is, placing collision change objects is a pain in the ass, and it's very easy to get it wrong. Especially when your level has complex overlapping routes and you're rushing to meet a McDonald's tie-in promotion.